Pressure control system for a hydraulic lift and flotation system
First Claim
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1. A hydraulic lift and flotation system comprising:
- a hydraulic cylinder to provide lift and flotation functionality for a machine;
a pump to circulate a hydraulic fluid in the hydraulic lift and flotation system;
a relief valve in fluid communication with the pump, the relief valve providing general pressure regulation in the hydraulic lift and flotation system;
an unload valve in fluid communication with the pump and a controller, the unload valve controlling pressurization in the hydraulic lift and flotation system;
a solenoid configured and positioned to control opening and closing of the unload valve;
the controller programmed to execute a control algorithm to provide control instructions to the solenoid to control the unload valve; and
the control instructions operating the solenoid to close the unload valve over a period of time to control a rate of pressure rise in the hydraulic lift and flotation system until a predetermined pressure is obtained.
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Abstract
A control system is provided to control the rate of pressure rise in a hydraulic lift and flotation system. When a hydraulic cylinder of the hydraulic lift and flotation system is to be adjusted, the pressure in the hydraulic lift and flotation system has to be increased to a predetermined pressure controlled by a relief valve before the hydraulic cylinder can be operated. The unload valve of the hydraulic lift and flotation system can be closed in a controlled or regulated manner in order to control the rate at which pressure rises in the hydraulic lift and flotation system.
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Citations
11 Claims
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1. A hydraulic lift and flotation system comprising:
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a hydraulic cylinder to provide lift and flotation functionality for a machine; a pump to circulate a hydraulic fluid in the hydraulic lift and flotation system; a relief valve in fluid communication with the pump, the relief valve providing general pressure regulation in the hydraulic lift and flotation system; an unload valve in fluid communication with the pump and a controller, the unload valve controlling pressurization in the hydraulic lift and flotation system; a solenoid configured and positioned to control opening and closing of the unload valve; the controller programmed to execute a control algorithm to provide control instructions to the solenoid to control the unload valve; and the control instructions operating the solenoid to close the unload valve over a period of time to control a rate of pressure rise in the hydraulic lift and flotation system until a predetermined pressure is obtained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification